Enzyme EC numbers

EC (Enzyme Commission) numbers assigned by IUPAC-IUBMB

2. Transferases;
  2.5  Transferring alkyl or aryl groups, other than methyl groups;
    2.5.1  Transferring alkyl or aryl groups, other than methyl groups (only sub-subclass identified to 
           date)
      2.5.1.-  cysteate synthase